(-m-2n)²=

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(-m-2n)²=(-m-2n)²=(-m-2n)²=(-m-2n)²=(m+2n)²=m²+4mn+4n²

(-m-2n)²=
(-m-2n)²=

(-m-2n)²=
(-m-2n)²
=(m+2n)²
=m²+4mn+4n²